Gray rocks & minerals
Gray rocks and minerals are extremely common in the field. Hardness, density, and how the specimen breaks (fracture vs. cleavage) tell you more than color alone.
Showing 241–360 of 744 gray rocks (page 3 of 7).
Siltstonecommonsedimentary · Mohs 3-4gray, red, brown
Silveruncommonmineral · Mohs 2.5-3silver-white, gray, black- Silveruncommonmineral · Mohs 2.5-3silver-white, gray, black
Slatecommonmetamorphic · Mohs 2.5-4gray, black, green
Smithsonitecommonmineral · Mohs 4-4.5white, gray, green
Smoky Quartzcommonmineral · Mohs 7brown, gray, black
Snakeskin Agatecommonmineral · Mohs 6.5-7white, gray, tan
Soapstonecommonmetamorphic · Mohs 1gray, green, white
Sodalitecommonmineral · Mohs 5.5-6blue, white, gray
Spodumeneuncommonmineral · Mohs 6.5-7colorless, white, gray
Sponge Fossilcommonfossil · Mohs 2.5-7gray, white, tan
Star Sapphireraregemstone · Mohs 9blue, gray, violet
Starfish Fossiluncommonfossilgray, brown, tan
Staurolite Schistcommonmetamorphic · Mohs 3.5-7dark brown, gray, brownish-black
Steatitecommonmineral · Mohs 1gray, green, white
Stony Meteoriterareigneous · Mohs 5-7gray, brown, black
Strontianitecommonmineral · Mohs 3.5colorless, white, gray
Sueviteuncommonigneous · Mohs 5-6gray, brown, greenish
Syenitecommonigneous · Mohs 6gray, pink, white
Tabulate Coralcommonfossil · Mohs 5-7tan, brown, gray
Talccommonmineral · Mohs 1white, gray, green
Thundereggcommonmineral · Mohs 6.5-7multicolored, brown, gray
Titaniteuncommonmineral · Mohs 5-5.5yellow, brown, green
Tremolitecommonmineral · Mohs 5-6white, gray, green
Trilobitecommonfossilbrown, gray, black
Tube Agatecommonmineral · Mohs 6.5-7white, gray, blue
Tufacommonsedimentary · Mohs 3white, gray, yellow
Tuffcommonigneous · Mohs 2-4white, gray, tan
Uraniniteuncommonmineral · Mohs 5-6black, brownish-black, gray
Welded Tuffcommonigneous · Mohs 3-6gray, tan, pink
Witheriteuncommonmineral · Mohs 3-3.5white, gray, yellow
Wood Opalcommonfossil · Mohs 5.5-6.5brown, tan, gray
Yooperlitecommonigneous · Mohs 6gray, gray-brown
Zirconcommonmineral · Mohs 7.5brown, red, yellow
Zoisitecommonmineral · Mohs 6-7gray, green, pink- No imageAcetamideraremineral · Mohs 1-1.5colorless, gray
Achávaliteraremineral · Mohs 2.5gray- No imageAdeliteraremineral · Mohs 5green, blue gray, gray
Agate Nodulecommonmineral · Mohs 6.5-7banded, white, gray
Agatized Algaecommonfossil · Mohs 6.5-7brown, red, tan
Agatized Clamcommonfossil · Mohs 6.5-7white, gray, brown- No imageAgatized Fern Buduncommonfossil · Mohs 6.5-7brown, tan, gray
Agatized Fossilcommonfossil · Mohs 6.5-7brown, red, yellow
Agatized Fossil Shellcommonfossil · Mohs 6.5-7white, brown, red- No imageAgatized Limb Castuncommonfossil · Mohs 6.5-7brown, red, yellow
Agatized Palm Woodcommonfossil · Mohs 6.5-7brown, tan, gray
Aguilariteraremineral · Mohs 2.5gray, iron gray, black- No imageAkhtenskiteraremineral · Mohs 2-3black, gray
Aksaiteraremineral · Mohs ~2.5colorless, gray, light gray- No imageAlexkhomyakoviteraremineral · Mohs ~3colorless, white, gray
Algodoniteraremineral · Mohs 4silver white, gray, steel gray
Alstoniteraremineral · Mohs 4-4.5colorless, gray, white
Althausiteraremineral · Mohs 3.5-4gray
Alumoåkermaniteraremineral · Mohs 4-5colorless, white, gray
Alumohydrocalciteraremineral · Mohs 2.5chalky white, bluish white, violet
Alunitecommonmineral · Mohs 3.5-4white, gray, yellowish gray
Amblygoniteuncommonmineral · Mohs 5.5-6white, yellow, gray
Ancylite-(Ce)uncommonmineral · Mohs 4-4.5brown, brown red, colorless- No imageÁngelaiteraremineral · Mohs 3.5gray
Aphthitaliteuncommonmineral · Mohs 3blue, colorless, green
Armalcoliteraremineral · Mohs 6gray
Arrowheadcommonfossil · Mohs 6.5-7white, gray, brown
Aschamalmiteraremineral · Mohs 3.5lead gray, gray
Axinite-(Fe)uncommonmineral · Mohs 6.5-7brown, purplish blue, gray
Axinite-(Mg)raremineral · Mohs 6.5-7brown, purplish blue, gray- No imageBadaloviteraremineral · Mohs ~3.5pale green, green, greenish gray
Balkaniteraremineral · Mohs ~3.5gray, steel gray
Balmorhea Blue Agateuncommonmineral · Mohs 6.5-7blue, gray, white
Bambollaiteraremineral · Mohs 3brownish gray, gray
Banded Agatecommonmineral · Mohs 6.5-7white, gray, blue
Banded Opalcommonmineral · Mohs 5.5-6.5white, gray, brown- No imageBarquilliteraremineral · Mohs 4-4.5gray
Barysiliteraremineral · Mohs 3white, gray
Barytocalciteraremineral · Mohs 3.5-4white, yellow, gray
Bauxitecommonsedimentary · Mohs 1-3red, brown, tan
Beidellitecommonmineral · Mohs 1-2white, gray, reddish white
Bementiteraremineral · Mohs 4.5-6brown, gray, yellow
Benavidesiteraremineral · Mohs 2.5lead gray, gray
Benleonarditeraremineral · Mohs 3.5gray, black
Bentonitecommonsedimentary · Mohs 1-2white, cream, gray
Bergslagiteraremineral · Mohs 5colorless, gray, gray white
Berliniteraremineral · Mohs ~6.5colorless, gray, gray pink
Berryiteraremineral · Mohs 3.5blue gray, gray
Berzelianiteraremineral · Mohs 2.7bluish gray, gray, black
Beyeriteraremineral · Mohs 2-3yellow, gray, gray green
Bismocliteraremineral · Mohs 2-2.5brown, colorless, gray
Bismuthinitecommonmineral · Mohs 2-2.5gray, silver white, tin white
Bismutiteuncommonmineral · Mohs 2.5-3.5yellow, brown, brownish yellow
Blue Agatecommonmineral · Mohs 6.5-7blue, white, gray
Blue Agate Geodecommonmineral · Mohs 6.5-7blue, white, gray
Blue Silicified Coraluncommonfossil · Mohs 6.5-7blue, gray, white
Bluestonecommonsedimentary · Mohs 3-7blue, gray, bluish-gray
Bobierriteraremineral · Mohs 2-2.5colorless, gray, white- No imageBobtrailliteraremineral · Mohs 5.5gray, pale green, brown
Boratecommonmineral · Mohs 2-4white, colorless, gray- No imageBorodaeviteraremineral · Mohs 3.5gray
- No imageBoscardiniteraremineral · Mohs 3-3.5gray
Boulangeriteuncommonmineral · Mohs 2.5-3lead gray, blue gray, gray
Bournoniteuncommonmineral · Mohs 2.5-3steel gray, gray, black
Bowieiteraremineral · Mohs 7gray, pale gray, pale brownish gray
Bradleyiteraremineral · Mohs 3.5white, gray, colorless
Brain Coralcommonfossil · Mohs 3-4white, tan, brown
Bredigiteraremineral · Mohs 5.5-6colorless, gray
Brewsterite-Sruncommonmineral · Mohs 5-5.5white, yellowish white, gray- No imageBrezinaiteraremineral · Mohs 3.5-4.5brownish gray, gray
Briartiteraremineral · Mohs 4.5blue gray, gray, iron gray
Brinrobertsiteraremineral · Mohs 1-2gray, yellowish gray
Brucitecommonmineral · Mohs 2.5white, blue, gray
Brunogeieriteraremineral · Mohs 5gray, black
Burkeiteraremineral · Mohs 3.5white, gray, gray white
Calcified Coralcommonfossil · Mohs 3-4white, brown, tan- No imageCalcio-olivineraremineral · Mohs 6white, colorless, gray
Calcioancylite-(Ce)raremineral · Mohs 4-4.5colorless, gray, pale yellow
Calcite Nodulecommonmineral · Mohs 3white, yellow, gray
Calomelraremineral · Mohs 1.5white, yellowish gray, gray
Cameroniteraremineral · Mohs 3.5-4gray, black
Cancrisiliteraremineral · Mohs 5lilac, colorless, gray
Caracoliteraremineral · Mohs 4.5blue, colorless, greenish gray
Carlsbergiteraremineral · Mohs 7gray
Carrolliteraremineral · Mohs 4.5-5.5gray, copper red, light gray
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